Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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INTERLEAVING APPARATUS FOR ROLLED UP SEGMENTS
Field of the Invention
This invention has to do with apparatus for the
production of a plurality of individual bags rolled up to
form a package of bags on a roll. The individual bags
are wound up with the leading edges of trailing bags
overlapping the trailing edges of leading bags as the
bags are fed into the windup apparatus forming the
roll.
Backqround of the Invention
More specifically a windup apparatus is provided
wherein a well known turret style winder is used to make
rolls of bags, or other elements in a broad sense. A
turret style winder is commonly used in winding up a web
of bags which are perforated between the bags but
connected on the final roll, The bag seg~ents are held
together at the perforations in the roll of bags and
provide an easily separable juncture between ~`
longitudinally adjacent bags. The consumer tears bags
; 20 of~ the roll at the perforations as a bag is needed.
The only time the p~rforation is used to separate
adjacent bags by the equipment is when a predetermined
number of bags--for instance twenty-five bags
constituting a roll o~ bags~-has been wound up by the
25 winder~ Upon reaching a count of twenty-five bags the -~
well known e~uipment will sever the perforation between
the twenty-fifth and the subsequent bag. A new roll of ~;~
bags will be started onto a core, or a coreless winding
shaft when coreless rolls of bags are wound, which has
been sequenced into position on the turret winder.
Most usually, rolls of plastic bags are wound into a
coreless roll although sometimes bags on cores are
desired. The type of bag most typically found on a
coreless roll are bags known as trash or garbage bags.
These bags are folded lengthwise to make a narrow compact
segment about thirty inches long and six to eight inches
widP. When the bags are unfolded they may be within the
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range of twenty-four to thirty-two inches wide. These
dimensions are only one example o~ possible bag sizes.
Obviously garbage bags can be of a whole range of sizes.
Consider, for example, bags to wrap deployed Christmas
trees, bays to line so called fifty-five gallon drums,
sandwich size bags and other longitudinally and
transversely fold~d and unfolded bags.
Additionally, other items can be wound up on turret
rollers of the type discussed herein. For instance
elongated or longitudinally folded banners, signs, bumper
stickPrs, precut tape segments, tubes of plastic or other
material, woven products such as precut bandages, etc.
The list of items that can be rolled up and dispensed
from a roll is long. If these items have to be connected
together, end-to-end, as it were, there are limits to the
list of items that can be wound into a roll. For
instance if bumper stickers are held together by a
perforation a somewhat undesirable ragged end/edge could
result when they are pulled apart by the consumer. So
also with precut tape segments and bandages. And, of
course, so also with longitudinally folded bags. But if
the segments are simply wound up as discrete elemPnts
then as they are unwound for use there is no degradation
of the segments as they are pulled ofP the roll.
Summary of the Invention
One way of winding bags (or elements)into a roll of
bags is provided by the inv~ntion disclosed herein.
The key element of this invention is the apparatus
and method of overlapping or interleaving bag segments so
that one bag follows another onto the roll being formed
without an interruption between the bag segments. As the
windup core spindle is driven, in a preferred embodiment,
a gap between bag segments would necessitate the starting
and guiding of each bay onto the roll of bags ~eing
formed. This is a dif~iculty. The first bag guided onto
the spindle is held on the spindle in the applicant's
device, as well as in prior art devices, by vacuum
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between the spindle and the first layer of bag. There is
no vacuum for the second bag hence it is difficult to get
the second bag to sta~rt onto the top of the first bag.
One solution to this problem is to interleaf the
bags s~ that the leading edge of a second or trailing bag
is overlapped over the trailing end of a ~irst or leading
bag such that the trailing bag leading end is captured in
the bite between the roll of bags that has been formed
and the trail end o~ the leading bag. Once this .second
bag is started into the roll being formed it i~ sometimes
unimportant that the bags remain overlapped, although an
overlap may assist in dispensing bags when they are
pulled out of a roll storage container or dispenser.
The bag overlap is established in this invention at
an overlap forming zone of the apparatus. The overlapped
bags proceed to the windup proper in an overlapped
attitude. The overlap forming zone includes the use of
air pressure or an air stream directed at the bags in a
timed relationship and the use of a bag holding vacuum
manifold in one embodiment. The timing of the
application of air flow, both pressure and vacuum are
important in establishing the desired overlap.
In an alternative embodiment a vacuum box rather
than the vacuum manifold is used as will be explained
further on.
It should be appreciated that the object of this
invention is to provide an overlap in bags being
delivered to a windup zone. The method and apparatus
presented eliminates the requirement of having bags
connected to each other as they are being wound up.
Accordingly another aspect of this invention is to
provide a roll of bags that will not have to be torn
apart at perforations for a consumer to take one bag from
a roll of bags.
This invention also provides for product stream
"pull through" by means of belts placed against the upper
and lower surfaces of bags making up the product stream
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so that the positive connection between bags (at the
parforation) can be done away with. Having the bags
connected together to pull the product stream through the
windup is not necessary if the overlap is provided and
top and bottom belts are utilized.
In accordance with an aspect of the invention, an
interleaving and roll forming apparatus for overlapping
successive individual web segment material and forming a
roll of interleaved web segments, comprises:
means for receiving and advancing the leading end
portion at a second speed slower than the first speed for
forming a loop between opposita ends of tha advancing
incoming web segment;
means for separating a trailing end portion of the
advancing and now l ading web segment rom a leading end
portion of a successive incoming web segment;
means for advancing the leading end portion of the
successive incoming web segment at the first speed to the
loop forming means and overlapping it over the trailing
end portion of the leading web segment;
means for receiving the leading end portion o~ the
leading web segment and winding the overlapping web
segments into a roll; and
;~ means for forming a subsequent roll of overlapping
segments without interruption of feed into the receiving
and winding means upon completion of the first mentioned
roll.
In accordance with another aspect of the invention,
a method of interleaving individualized web segments and
forming a roll comprises steps of:
individualizing a leading web segment from a
trailing web segment;
guiding a leading edge of said leading web segment
into a downstream gripping means;
urging a trailing end of said leading web segment
into an overlap forming zone upstream of said gripping
means;
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guiding a leading edge of a successive web segment
into said gripping means before said leading weh segment
passes completely through said gripping means;
wrapping the leading ed~e of said leading web
segment around a downstream rotating spindle and starting
a foxmation of a roll;
guiding the leading edge of said trailing web
segment into the nip of the roll forming on said spindle
with said leading web segment; and
continuing enlarging the roll with said trailing web
segment and subsequent web segments.
In accordance with a further aspect of the
invention, a method of individualizing and interleaving
bags formed from a continuous web of material and ~orming
15 a roll of interleaved bags comprising the step of: .
separating a leading bag from a trailing bag;
.. forming a gap between said leading bag and said
; trailing bag~
guiding a leading edge of said leading bag into a
downstream nip roll set;
and
; guiding a leading edge of said successive bag into
said nip roll set on top of said trailing end prior to
said trailing end of said leading bag passing through
said nip roll set;
wrapping the leading edge of said leading bag around
a downstream rotating spindle and starting a formation of
a roll;
guiding the leading edge of said trailing bag into
the nip of the roll forming on said spindle with said
- leading bag; and
continuing enlarging the roll with said trailing bag
and subsequent bags.
~- In accordance with a further aspect of the
invention, a method for forming a roll of over].apping web
segments of material comprises the steps of:
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overlapping a leading end position of a trailing web
segment of material onto a trailing end portion of a
leading web of material;
winding the leading web of material into a roll;
introducing the leading overlapping end portion o~
the trailing web segment of material into a nip of the
roll formed by the roll and the trailing end portion of
the leading web of material.
In accordance with another aspect of the invention,
an apparatus for overlapping individual webs of material
and forming a roll of interleaved webs of material
comprising:
a means for overlapping a leading end portion of a
trailing web of material onto a trailing end portion of a
leading web of material; and
a means for winding the leading web of material into
a roll and for gripping the overlapping leading end
portion of the trailing web of material between a nip
between the leading web of material winding on the
gripping means and the trailing end portion thereof.
In accordance with another aspect of the invention,
an apparatus fvr overlapping successive individual web
segments from a continuous roll of web segment material
and forming a roll of interleaved web segments,
~ 25 comprises:
:; a first means for advancing a leading end portion of
an incoming web segment at a first speed;
a second means for advancing the leading end portion
at a second speed slower than the first speed;
an intermediate means between the first and second
means for tensioning the incoming leading web segment and
separating its trailing end portion from a successive
leading end portion of a trailing incoming web segment;
a means for advancing the successive leading end
portion of the trailing incoming web segment at the first
speed and overlapping it over the trailing end portion of :
the leading web segment;
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a means for winding the leading web segment and the
overlapping successive leading end portion of the
trailing web segment into a first roll; and
a means for forming a subsequent roll of overlapping
leading and trailing web segments without interruption of
feed into the winding means upon completion of the first
roll.
Brief Description of the Drawinq Figures
In the drawing figures:
Fig. 1 is a side elevation view of a wlndup for
winding up rolls of product on a turret winder with some
parts broken away to show interior components and some
nonessential parts left off for clarity;
Figs. 2-7 are pictorial schematics of an overlap
forming zone showing the progressive development of a
series of bags through the overlap forming zoneî
Figs. 8-15 are pictorial schematics of an
alternative overlap forming zone showing the progressive
-; development of a series of bags through the alternative
overlap forming zone;
Figs. 16-23 are pictorial schematics of an
alternative embodiment showing the progressive
developmPnt of a series of bags through the alternative
overlap forming zone; and
.~: 25 Fig. 24 is a side elevation Yiew of an alternative
embodiment of the windup for winding up the rolls of
product on a turret winder which is similar in
:-~ construction to the turret winder of Figure li
; Figs. 25 throuyh 30 are pictorial schematics of
another embodiment for the overlap forming zone of the
type shown in Figs. 2 through 7; and
Figs. 31 through 38 are pictorial schematic~ of an
alternative embodiment for the overlap forming zon~ of
the type shown in Figs. 8 through 15.
Detailed Description of the Invention
~ An appreciation and full underst~n~ing of this
:: invention, and various alternative embodiments of it,
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will be gleaned from a perusal of the drawing figures in
juxtaposition to a reading o~ the following description.
Initially, a preferred embodiment o~ the invention
is shown in Figs. 1 through 7. Turning first to Fig. 1
the winding apparatus is shown generally as 10.
~ frame 12 supports a drive motor 1~ which drives an
interleaving or overlap forming zone generally 16 through
drive belt 20. Downstream of the interleaving zone is a
turret winder 22 which supports a plurality of coreless
windup spindles, in this casa three spindles 2~a, 24b and
24c. Various components of the apparatus will be
described by following the path that a bag follows. It
should be pointed out that the term "web", "segment" or
"bag" is being used to describe any product that would be
wound up into a roll such as longitudinally folded or
longitudinally and horiæontally folded trash bags,
separated elements, or the like of any product that is
described above, or any product that would logically be
wrapped into a roll.
A continuous web or sheet of film 26 enters the
windup at an infeed and thereof. This web would
typically have cross seals and perforations at each seal
that was formed in the web upstream of the winder. The
web could have been folded longitudinally to make several
layers of film prior to entering the winder, or the web
zould have been folded prior to forming cross seals for
manufacturing a star bottom bag. This would be the usual
situation for bags~ The web is drawn into the feed rolls
3oa and 30b which are driven by motor 14 throuyh belt 20
and a second driving belt 32. The feed rolls 30a and ~Ob
are speed matched with the output feed rolls on the bag
machine (not shown). Rolls 30a and 30b may be constantly
pushed together by air cylinders (not shown) to maintain
pressure on the web 26. The web 26 will proceed
downstream generally passing through a gap between a nip
roll set or set of separation rolls 34a and 34bo
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The drive belt 20 may be a notched timing belt which
also drives a driving roll 36b and as stat~d above, ~he
nip roll 34b. A second pulley ~not shown) on the nip
roll 34b drives the second timing belt 32 to drive the
feed roll 30b. The pulley on the nip roll 34b i5 smaller
than the related pulley on the driven feed roll 30b so
that the surface speed on nip roll 34b is greater than
the surface speed on feed roll 30b.
The driving roll 36b is normally driven at a slower
speed than the feed roll 30b thus yielding a decrease in
web speed between the infeed side of the interleaving
zone, generally 16, and at the output side of the zone.
Normally, in current state of the art winders known to
the inventors there would be no speed differential
between the set of feed rolls 30a and 30b and the set of
driving rolls 36a and 36b. But in this invention these
set~ of rolls are driven at different speeds. This is
the first difference between the prior art winders and
the winder presented herein.
The web 26 is carried between a first lower belt 40
and a first upper belt 42 until the first lower belt
turns away from the first upper belt a~ roller 44. If
the leading edge of the web went straight to the next set
of rollers 36a and 36b~ which it does, it would follow a
generally straight plane. The medial section of the web
however doesn't follow this plane, but is urged out of
it. The web will be forced against the first upper belt
42 after the web passes the area of roller 44 by means of
a blast of air emanating from a first directed air flow
delivery manifold 46 which will provide a timed blast,
positive pressure air flow or curtain of air, as shown by
arrow "A", at the bottom of the web 26 in the overlap
forming zone, generally 50, to urge the web against the
first upper belt 42. Belts 40, and 42 can be nylon
elastic belts made up of a plurality of individual rope
like round elements~ The air curtain, arrow A, will
assure that the leading edge of the web 26a is directed
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to and enters the nip between the driving rolls 36a and
36b.
The actual overlap forming operation will be
described below, however for the moment the path o~ the
web, now separated into individual bags or segment~, will
be followed through the Fig. 1 elevation view o~ tha
winAer.
The overlapped bags will be transported,on second
lower belt 56 and under the second upper belt 52 to a
spindle 24. The preferred embodiment utilizes spindles
that are provided with apertures in their surface
connected to an interior passage through which a vacuum
can be drawn. Upon starting to wind up a coreless roll
of bags, an empty spindle such as 24c will be indexed to
a position on top of the web segments being wound up
downstream at spindle 24a. Timed to coincide with
spindle 24c being indexed an air horn 60 ha~ing an air
manifold 6~c will be pivoted downwardly generally above
the spindle 24c. When the leading edge of the first bag
to be rolled up on the spindle 24c approaches the spindle
the vacuum through the apertures in the spindle will
cause th~ leading edge of the first bag to wrap around
; the spindle 24c. The air manifold 66c is on the base of
; the air horn and will direct a blast of air, in the
upward position of the air horn 60, at the outside
surface of the first bag. This air stream acts to help
it get started on the rotating spindle 24c and to hold
the leading end down against the trailing end of the
previous bag as the bags exit the belts 52, 56. The
supporting conveyor may also be raised slightly to serve
the new bag to the spindl2. Once the first bag (and
possibly more than one bag) is secure on the spindle the
turret 62 will index to the position shown in Fig. 1 and
a roll of bags will then be formed on spindle 24c, as is
shown on spindle 24a.
As the turret indexes to the next spindle the full ~;
roll will be indexed to the uppermost turret position,
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shown occupied by empty spindle 24b, where pusher 64 willpush the full roll of bags off the spindle 24b. In a
preferred embodiment the vacuum on the spindle has been
reversed at this point to provide positive air pressure
as the roll of bags is being pushed off the spindle.
Preferably two air delivery manifolds 66A and 66B,
shown in Fig. 1, are provided on the turret winder 20,
although one would be optional as described with respect
to the embodiment of Fig. 24. The manifQlds each deliver
a stream of air toward the leading edge of the bag as the
bag approaches the roll of bags as shown in the ~igures.
Each air stream helps to keep the leadiny edge of the
bags down against the trailing end of the previous bag as
the leading end approaches the roll.
Turning now to Figs~ 2-7 the overlap ~orming and
interleaving operation will be described by discussing
the prograssive figures from Fig. 2 to Fig. 7.
As can be seen in Fig. 2 the leading edge on leading
end 26a is being held up against the first upper belt 42
by the air blast indicated by arrow A. The bag or web
26 is, of course, being driven downstream by the feed
rolls 30a and 30b between driven belts 40 and 42.
As the leading end 26a is nipped at driving rolls
36a and 36b the air supply at the first directed air flow
delivery manifold 46 is shut off. Driving rolls 36a and
36b are driven at a speed slower than feed rolls 30a and
30b so a loop will form in the web 26 in the loop forming
or overlap forming zone 50 as shown in Fig. 3. To assist
in forming the loop a discharge of air emanates from a
second directed air flow delivery manifold 70 in the
direction indicated by arrow B.
The trailing end of each bag or web segment, shown
as 26b has been perforated upstream of the winder as
stated above. When this perforation just passes the feed
roll set 30a and 30b and reaches a preselected location
the nip or separator roll set 34a and 34b will be urged
together to create a nip that drives the web faster than
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the normal web speed of Eead roll set 30a, 30b. The
faster web speed of nip rolls 34a and 34b relative to
feed rolls 30a and 30b, see Fig. 4, will increase the
tension in the web betwe0n these two ~ets of rolls and
separate the web into indiYidual web segments or bags at
the perforation. A gap such as 72 will form between the
web segments. The nip rolls 34a and 34b will then be
opened or separated from each other before the leading
end 26a of the following web segment reaches the nip roll
set 34a, 34b. This action thu~ separates each trailing
end of the leading bag or we~ segment from the leading
end of the successive bag segment on the continuous
perforated web 26.
Looking at Figs. 4 and 5 just after the trailing end
26b o~ the bag leaves the nip rolls 34a and 34b a blast
of high pressure air, identified by arrow B emanates from
the second directed air flow delivery manifold 70. This
high pressure blast of air will push the trailing end 26b
of the bag into the overlap forming zone 50 so that it is
directed by gravity assist or by another blast of high
pressure air from yet another air manifold (not shown)
into contact with the vacuum manifold 74. The vacuum
manifold is a structure having a front face 76 provided
with a plurality of perforations therethrough, such as
80, that draws air flow into them and urges the bag 26 to
be held closely to the front face of the vacuum manifold.
The trailing end portion 26b of the bag will
continue to travel tvward the turret winder 22 at a
slower rate than the leading end 26a of the next bag as
it is being driven through the feed rolls 30a and 30b
(Fig. 6~. The leading ~nd 26a of the incoming bag will
be guided onto the top of the trailing end 26b of the
previous bag as is shown in Fig. 7 and once its leading
end is trapped between the previous bag and the s~cond
upper belt 52 it will be drawn through the system as was
the first bag described above.
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It is expected that for som~ applications the second
bag will easily become mated with the trailing end of the
first bag ~s the bags are overlapped and drawn into the
driving rolls 36a and 36b, however for some web alements
or bags it may be desirable to create a light or
temporary adhesion between the trailing end of one bag
and the leading end of a second bag in the overlap area.
The inventors contemplate that this could be done in
various ways. For instance, an adhesive material, which
could be a "sticky" material or even water for that
matter, could be injected into the high pressure air
stream "B" when the trailing end of the bag is being
blown in Fig. 4. The adhesive could, alternatively be
injected into and blown toward the bottom side of the
leading end 26a of the bag with air ~low 'IA" (Fig. 2).
Alternatively an adhesive material could be applied
by an independent applicator to the top of the trailing
end or to the bottom of the leading end o~ the next
incoming bag.
Another alternative is to apply a static charge on
`~ the top side of the trailing end of the bag segment or
under the leading end of the next incoming bag from a
static charge inducer.
Once the overlap has been formed, the web,
consisting of the overlapped bags or other segments, is
supported on the second lower belt 56 to the turret
winder 22 where a roll of interleaved or overlapped bags
or segments are rolled up.
Another alternative embodiment of the invention is
shown in Figs. 8-15. In this embodiment a vacuum box 82
is added as an additional control means to assist in loop
formation. The loop forming cycle would be the same as
the cycle shown in Figs. 2-7 however a source of vacuum
would be supplied to the vacuum box (from a vacuum pump,
not shown) as the loop is being formed in the vacuum box
82 as shown in Fig. 11. The vacuum box, shown in a cross
sectioned or cut away view would be closed on all sides
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except the top where the bag would be drawn into the
vacuum box. In a pre~erred ~mbodiment th~ vacuum
manifold 74 would be integral with the vacuum box and
per~orm the same function it did in the preferred
embodiment described above.
Figs. 8-15 also show how a folded bag or folded
segment could be handled. In Fig. 8 the ~older,
generally 84, which is well know in principle, is used to
fold the individual bags or web segments transversely
rather than longitudinally as was done upstream in the
earlier preferred embodiment. The transverse fold allows
long articles to be folded "in half", to use the term
loosely, so that when the bags are unrolled from the
final roll the consumer would only have about half as
much web length to remove from the roll to get one bag
o~f.
In this alternative embodiment individual bags could
be delivered to the winder unit from an intermittent bag
making machine or a continuous motion bag maker which
~0 seals and perforates the web and separates each bag from
the continusus web.
Bags, such as 86 (one single reference number used
for each bag. Although they may be different unities
they are identical structures), would be folded by a
conventional air knife 90 which would direct a timed
blast of air, "D'l in Fig. 9, to fold the bags into the
nip of the winder feed rolls 30a and 30b. Note that in
this embodiment the nip rolls 34a and 34b of the first
embodiment are not needed as the bags arrive at the
overlapping zone 50 independent of each other.
The speed of the feed rolls 30a and 30b would be set
at about ten percent faster than the incoming film speed
from the bag maker or folder. This would open a gap
between the individual bags. Due to the double thickness
of the now folded bag additional loop forming control,
provided by the vacuum box 8Z, could be advantageous.
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Vacuum supply to the box 82 could ba an air amplifier, a
vacuum pump, a fan or the like.
In Figs. 8, 9 and 10 a bag 86 has been ~olded and is
carried to the interl~aving or overlapping zone 50 by the
first upper and lower conveyor set.
The air flow "A" from the first directed air flow
delivery manifold 46 assists the leading end of the bag
to reach the nip of the driving rolls 36a and 36b. Once
the bag has bridged the gap over the vacuum bo~ 82 air
flow"Bi' is directed from the second directed airflow
delivery manifold 70 to assist in loop forming. See Fig.
11. Additionally vacuum is supplied ~o the vacuum box 82
to suck khe bag into the box to form the loop~ The bag
continues to travel to the turret winder as shown in Fig.
12 and the trailing end 86b of the folded bag 86 is drawn
toward the vacuum manifold 74 and held against the vacuum
manifold lightly as the bag continues to be drawn toward
the turret winder.
As shown in Fig. 15 a second bag has b~en fed into
the nip of the driving rolls 36a and 36b and has been
blown and sucked into the vacuum box 82 by the second
directed air flow delivery manifold 70 and the vacuum box
itselE respectively. In this Fig. 15 the leading end of
- the second bag has been placed over the trailing end of
the previous bag and the principle used is the same as
that described int he preferred embodiment.
Adhesive enhancement, as described above, could also
be used in embodiments where folded bags are being
interleav2d or overlapped.
One enhancement is that where folded bags are being
rolled up the fold could be placed such that the fold
doesn't occur in the middle of the bag but is offset
thereby leaving a single bag (although the bag would have
several layers due to a longitudinal fold) thickness at
the trailing ends of the folded bag. This could reduce
the possible problem of winding different thicknesses of
web or film on the final roll.
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Another embodi~ent o~ the invention utilizes a
mechanical loop forming control instead of the air flow
dependent loop forming embodiments set forth in Figs.
1-15. In Figs. 16-23 a mechanical loop forming device is
set fQrth~ It is shown handling transversely folded bags
coming from a folder generally 84 as was shown in the
immediately previously described alternative embodiment.
In this mechanical loop forming embodiment a cam 92
operates in cooperation with a roc~er arm 94 in a well
known manner to urge a deflectable belt g6 wh.ich is the
top belt of a two belt set between which the bag 86 is
carried. (Although a cam actuated device is shown
numerous alternatives such as air cylinders, hydraulic
cylinders, chains, gears, etc. could be used to cycle the
de~lectable belt from one location to another.)
The deflectable belt 96 is entrained around a pulley
associated with the feed roll 30a which serves to drive
the belt. This could be a "rope" style belt as described
earlier. The deflectable belt travels to a first idler
20 roller 100 and thence to a second idler roller 102 which
are mounted together on a spacer 104 which sarves to
maintain a given distance between rollers 100 and 102.
The spacer 104 and the associated rollers 100 and 102 are
mounted to guide means such as 106 extending from a mount
25 110 to a second mount 112 as shown in Fig. 16.
The deflectable belt 96 is also entrained around
fixed idler 114. The deflectable belt maintains a given
length and is not appreciably stretched as it moves with
the spacer 104.
In Fig. 17 a bag 86 is just starting into the feed
roll nip. The folded leading end of the bag will bridge
the gap over the interle~ving zone with the help of the
curtain of air flow A emanating from the first directed
air flow delivery manifold 46. To this point the process
is as described above concerning the second ma~or
embodiment.
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In this embodiment an air blast is not used to ~orm
the loop in the bag, neither is a vacuum box. Rather the
mechanical loop former generally 116 is used to form the
loop. With the bag 86 shown in position in Fig. 18, the
spacer 104 will ~e urged to move by the rotating cam 92
action on the rocker 94 as shown in Fig. 19 or other
equivalent means. The bag will be forced into the area
between the vacuum manifold 74 and the first lower belt
40 as the deflectable belt 96, which is pressed against
the top side of the bag, follows the first and second
idler rollers 100 and lQ2 into the loop forming and
overlap forming zone. Once the deflectable belt 96 has
positioned the bag the cam g2 will continue to rotate and
the rocker arm, which may be spring loaded against the
cam, will carry the spacer, which is attached to the
rocker arm 94 out of the overlap ~orming zone. At this
point the vacuum will be on in the vacuum manifold 74 and
the trailing end of the bag 86, as shown in Fig. 20 will
be urged toward the face of the vacuum manifol~. It
should be mentioned that in Figs. 20-22 the trailing end
of the bag 86 does not appear to be flush against the
: face of the vacuum manifold however in operation the bag
: would normally be right against the face. It shows up a
bit more clearly in the figures with the bag slightly off
the face--which however does happen with some materials.
Fig. 22 starts the cycle over with the second bag having
bridged the gap. The cycle continues as previously
described and bag after bag follows the previous bag and
is interleaved or overlapped therewith as can be seen in
the figures and as explained.
The alternative embodiments of the invention, as
shown in Figs. 24 through 38, relate to rearrangem~nt of
the belt runs for belts 42 and 52 as well as revisions to
the air blow-down nozzle system 66. The previous
description of the invention with respect to Figs. 1
through 15 is essentially the same for Figs. 24 through
: 34 where the components of Figs. 24 through 34 with the
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18
same numeral designations are the same as the items
described with respect to Figs. 1 through 15. As shown
in Fig. 24 and remaining Figs. 25 through 38, the belt
runs 42 and ~2 have been charlged by a relocation of the
rollers which define overlapping regions of belts 42 and
52 and specifically a relocation in particular of roller
54. In either the embodiment of Fig. 1 or Fig. 24,
overlap of belts 42 and 52 along the length of the
apparatus remains. Alternatively, the air delivery
systems 66a, b and c can be revised in the manner shown
in Fig. 24 with the provi~ion of an air delivery manifold
6~. The manifold 66 delivers a stream o~ air towards the
leading edge of the bag as the bag approaches the roll of
bags. This air stream helps to ksep the leading edge of
the bags down against the trailing end of the previous
bag as the leading end approaches the roll 24a. As
already mentioned with respect to Figs. 25 through 30,
the alternative run set ups for belts 42 and 52 are shown
in the sequence of events of the overlap forming zone.
As well the alternative embodiment for the belt runs 42
and 52 are shown in Figures 31 through 38 which deal with
; alternative arrangements for the overlap forming zone.
In a broad recitation it can be seen that what has
been described is a method of interleaving web means by
individualizing a first web segment from a trailing web
segment and then guiding the l~ading edge of the first
web segment into a downstream gxipping means. Once this
is done the apparatus will urge a medial section of the
first web segment out of the plane ~ollowed by the
leading edge of the first web segment. The trailing edge
of the first web will also be urged out of this plane and
both the medial section and trailing section will enter a
zone upstream of said downstream gripping means. The
leading edge of a second or trailing web segment means
will then be guided into the gripping means before the
trailing end of the first web means pa~ses completely
through the gripping means.
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19
Several embodiments of this invention have been
shown. Each shares the concept of interleaving or
overlapping cut segments of web so thak they can be wound
up as if they were a continuous web when they reach the
turret winder. Several further embodiments are
contemplated by the inventor--such as having the overlap
zone rotated from a vertical deployment--it could just as
easily be horizontal--or using adhesive in each of the
embodiments. The following claims attempt to cover the
invention herein however every nuance of design not
claimed but within the spirit of these claims is believed
to be within their scope.
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